1. Article Body
A mobile or manufactured home roof has more in common with a small commercial low slope roof than with a house roof, and treating it like a house roof is how owners waste money.
It is a low slope roof
Most manufactured homes have a shallow arched or nearly flat roof, originally a metal panel or a rolled membrane.
Shallow slope means water leaves slowly, seams matter more than the field, and any ponding is a genuine problem rather than a cosmetic one.
The weight limit rules the decision
Manufactured homes are built to a light structural standard. The roof structure was designed for the original covering and very little else.
That excludes tile outright and constrains many conventional options. Adding significant weight without a structural assessment risks deflection and, in an extreme case, structural failure.
This single constraint explains why the mobile home roofing market looks so different from the house roofing market.
The realistic options
Roof coating systems. Elastomeric, acrylic or silicone coatings applied over a cleaned and prepared existing roof. Light, relatively inexpensive, and the most common answer. They need recoating on a cycle rather than lasting indefinitely.
Single ply membrane. TPO or EPDM adhered over the existing structure. Heavier than a coating, lighter than most alternatives, and a genuine roof rather than a surface treatment.
Metal roof over. New panels installed over the existing roof on a light framework. Durable, and it creates a ventilated cavity that helps with the condensation problem.
Full roof over with a pitched structure. A new framed roof built above the original, converting a flat roof to a pitched one. The most expensive option, the longest lasting, and a structural project requiring assessment and usually a permit.
Condensation is the recurring problem
The cavity between the ceiling and the roof is shallow, often poorly ventilated, and directly below a metal surface.
Warm moist air from inside meets cold metal and condenses. It drips back onto the ceiling and is almost always reported as a leak.
Any roofing solution that does not address ventilation leaves the problem in place.
Seams and terminations
On the original roof, every seam, every fastener line, and the termination at the perimeter trim are the failure points. The middle of a panel rarely fails.
Annual sealing of seams was the traditional maintenance routine, and on an uncoated original roof it still is.
Park rules and permits
Homes in a community may face park rules about appearance, height and contractor requirements. Permit requirements vary and a structural roof over generally needs one.
What to establish first
The existing roof type. Whether the structure has been assessed for added weight. Whether the problem is leaking or condensing. Whether the home sits in a community with rules. How long you intend to keep the home.
